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Inconel Shoulder Bolts

Inconel Shoulder Bolts like Inconel 600, 601, 625, 686, 718, 725 & X750 fasteners- bolts, nuts, screws, washers, are a family of nickel-chromium-molybdenum alloys used for their high strength at elevated temperatures and good corrosion resistance. Because of its high thermal stability, Inconel can be used in service temperatures ranging from cryogenic to 2200°F (982°C). The high alloy content of Inconel Nutsenable it to withstand a wide variety of severe corrosive environments. In mild environments, such as the atmosphere, sea water, neutral salts, and alkaline media, there is almost no attack to Inconel Shoulder Bolts. In more severe corrosive environments the combination of nickel and chromium provides resistance to oxidizing chemicals, whereas the high nickel and molybdenum contents supply resistance to nonoxidizing environments.

RAYCHIN SPECIALTY METALS FASTENERS: BOLTS, NUTS, SCREWS, WASHERS, STUDS, THREADED RODS, U-BOLT, J-BOLTS

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A Ni-Cr alloy known for its high temperature stability & corrosion resistance
High temperature stability up to 2200°F (1204°C)
Good corrosion resistance at elevated temperatures
High strength material with excellent toughness at elevated temperatures
Inconel grades: 600, 601, 625, 686, 718, 725, X750

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RAYCHIN LIMITED

Name: Inconel Shoulder Bolts
SKU: 0

Inconel Shoulder Bolts · Stripper Bolts · Precision Ground Shoulder · Socket Head / Hex Head

Inconel Shoulder Bolts: Nickel-Chromium Superalloy Stripper Bolts for Precision Motion Applications

Inconel 600 (UNS N06600 / 2.4816) | 625 (UNS N06625 / 2.4856) | 718 (UNS N07718 / 2.4668) | X-750 (UNS N07750) | 601 (UNS N06601 / 2.4851)

RAYCHIN LIMITED is a leading manufacturer of Inconel Shoulder Bolts – precision fasteners designed to serve as pivot points, shafts, and guides for rotating or sliding components. Also known as stripper bolts, these fasteners feature a three-part design: a head (typically socket or hex) for torque application, a precision-ground unthreaded shoulder that acts as a bearing surface, and a threaded shaft for secure mounting. Manufactured from premium nickel‑chromium superalloys, they deliver exceptional high‑temperature strength up to 1150°C, outstanding oxidation resistance, and immunity to chloride‑ion stress corrosion cracking. Our portfolio includes all standard and custom configurations manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS standards. Whether you require Inconel 718 shoulder bolts for aerospace actuators, Inconel 625 shoulder bolts for marine pivot mechanisms, or Inconel 600 shoulder bolts for nuclear guide systems, RAYCHIN delivers precision, quality, and full traceability. All mechanical properties are presented in MPa and ksi (kilopound per square inch).

Inconel shoulder boltsInconel stripper boltsInconel 600 shoulder boltsInconel 625 shoulder boltsInconel 718 shoulder boltsInconel X-750 shoulder boltsUNS N06600 shoulder boltsUNS N06625 shoulder boltsUNS N07718 shoulder bolts2.4816 shoulder bolts2.4856 shoulder bolts2.4668 shoulder boltsASTM B166 shoulder boltsASTM B446 shoulder boltsASTM B637 shoulder boltsASME SB166 shoulder boltsNACE MR0175 shoulder boltshigh temperature shoulder boltscorrosion resistant stripper boltsprecision ground shoulder boltsaerospace shoulder bolts

Inconel Shoulder Bolts – Design & Configurations

Three-Part Design

Inconel shoulder bolts consist of three precision-machined sections: the head (socket, hex, or slotted) for torque transmission; the unthreaded shoulder, ground to tight tolerances (±0.025mm / ±0.001") to act as a bearing surface for rotating parts; and the threaded shaft for secure mounting. The shoulder diameter is slightly larger than the thread major diameter, allowing assembled components to rotate freely on the shoulder without contacting the threads.

Head Styles & Drive Options

Available head styles: socket head (most common, per ASME B18.3), hex head (per ASME B18.2.1), low-profile hex, and slotted head. Drive types: hex socket (Allen), hex wrench, and slotted. Custom drive depths and tamper-resistant options available. Socket head sizes from .050" to 3/8" (1.5mm to 10mm).

Shoulder & Thread Specifications

Inconel shoulder bolts available with shoulder diameters from 1/8" to 1" (M3 to M24) and shoulder lengths from 1/8" to 6" (3mm to 150mm). Thread sizes from #2 to 5/8" (M2 to M16) with UNC, UNF, and metric coarse threads. Precision-ground shoulder ensures concentricity within 0.05mm TIR. Full thread standard; custom shoulder/thread ratios available.

Aerospace & Military Standards

Our Inconel shoulder bolts meet NAS1802 (hex head), applicable sections of NAS1351/1352 (socket head), and MS standards for shoulder bolt configurations. Full compliance with AMS 5662 (718), AMS 5666 (625), and AMS 5665 (600) for material and heat treatment. Used in flight control actuators, landing gear mechanisms, and missile guidance systems.

Industrial & Petrochemical Grades

Inconel shoulder bolts for oil & gas, chemical processing, and power generation manufactured to ASTM B166 (600/601), ASTM B446 (625), ASTM B637 (718/X-750), API 20F, and NACE MR0175/ISO 15156. Supplied with EN 10204 3.1/3.2 certifications and full NDT (PMI, UT, MPI) upon request.

Custom & Non-Standard Shoulder Bolts

Need a special shoulder length, unique head style, or proprietary drive? RAYCHIN engineers design and produce custom Inconel shoulder bolts to your exact specifications – any Inconel grade, any heat treat condition (annealed, aged), with full material traceability. Prototype to production volumes supported.

Critical Applications of Inconel Shoulder Bolts

Aerospace & Defense

Inconel 718 shoulder bolts used in flight control actuators, landing gear pivot points, missile fin actuators, and thrust reverser mechanisms. The precision shoulder serves as a bearing surface for rotating components under extreme loads and temperatures up to 700°C. Inconel 718 fasteners were critical components in the Space Shuttle program, demonstrating unparalleled reliability.

Oil & Gas / Sour Service

Inconel 625 shoulder bolts and Inconel 718 shoulder bolts qualified per NACE MR0175 for subsea actuator pivot points, valve linkage mechanisms, and blowout preventer assemblies. Resist sulfide stress cracking (SSC) and pitting in H₂S/CO₂ environments. Precision shoulder ensures smooth operation under high pressure.

Power Generation

Inconel shoulder bolts in gas turbine linkage systems, steam turbine governor mechanisms, and nuclear control rod guide systems. Maintain dimensional stability after thousands of thermal cycles from -200°C to 700°C. Non-magnetic properties ideal for sensitive instrumentation mounts.

Chemical Processing

Inconel 625 shoulder bolts resist boiling sulfuric acid, hydrochloric acid, and chlorinated solvents in reactor agitator linkages, pump pivot mechanisms, and valve actuator systems. Immunity to chloride stress corrosion cracking ensures long-term reliability. Precision shoulder allows smooth rotation in aggressive media.

Marine & Offshore

Inconel shoulder bolts in seawater pump linkages, rudder pivot mechanisms, and subsea manipulator arms resist pitting and crevice corrosion in saltwater. Ground shoulder provides reliable bearing surface even after years of continuous immersion.

Industrial Machinery & Automation

Inconel shoulder bolts in high-temperature oven conveyors, furnace door linkages, and automated assembly equipment. Withstand repeated thermal cycling while maintaining precise alignment. Superior galling resistance ensures repeated disassembly without thread damage.

International Standards & Global Designations – Inconel Shoulder Bolts

RAYCHIN LIMITED manufactures Inconel shoulder bolts from material conforming to the most widely used national and international specifications. All material is traceable to the mill.

Inconel Grade	UNS	DIN / W. Nr.	EN	BS	Applicable Specifications (Shoulder Bolts)
Inconel 600	N06600	2.4816	NiCr15Fe	NA14	ASTM B166 / ASME SB166; AMS 5665; NACE MR0175; suitable for shoulder bolt applications
Inconel 625	N06625	2.4856	NiCr22Mo9Nb	NA21	ASTM B446 / ASME SB446; AMS 5666; API 6A; NACE MR0175; excellent for marine & chemical
Inconel 718	N07718	2.4668	NiCr19Fe19Nb5Mo3	—	ASTM B637; AMS 5662 / 5663; API 6A718; NACE MR0175 / ISO 15156‑3; ideal for high-stress
Inconel X-750	N07750	2.4669	NiCr15Fe7TiAl	—	ASTM B637; AMS 5667 / 5668; NACE MR0175; high-temperature spring applications
Inconel 601	N06601	2.4851	NiCr23Fe	—	ASTM B166 / ASME SB166; AMS 5870; superior oxidation resistance up to 1150°C

UNS N06600 2.4816 UNS N06625 2.4856 UNS N07718 2.4668 UNS N07750 2.4669 NACE MR0175 API 20F

Chemical Composition (Weight %) – Inconel Alloys for Shoulder Bolts

Our Inconel shoulder bolts are produced from melts conforming to the following limits per ASTM/ASME/AMS.

Inconel 600 (UNS N06600 / 2.4816)

Element	Min %	Max %	Typical
Ni (+Co)	72.0	—	76.0
Cr	14.0	17.0	15.5
Fe	6.0	10.0	8.0
C	—	0.15	0.08
Mn	—	1.0	0.5
Si	—	0.5	0.2
S	—	0.015	0.008
Cu	—	0.5	0.2

Inconel 625 (UNS N06625 / 2.4856)

Element	Min %	Max %	Typical
Ni (+Co)	58.0	—	61.0
Cr	20.0	23.0	21.5
Mo	8.0	10.0	9.0
Nb (+Ta)	3.15	4.15	3.6
Fe	—	5.0	2.5
C	—	0.10	0.03
Mn	—	0.50	0.2
Si	—	0.50	0.2
Al	—	0.40	0.2
Ti	—	0.40	0.2

Inconel 718 (UNS N07718 / 2.4668)

Element	Min %	Max %
Ni	50.0	55.0
Cr	17.0	21.0
Nb (+Ta)	4.75	5.50
Mo	2.80	3.30
Ti	0.65	1.15
Al	0.20	0.80
Fe	balance
Mn	—	0.35
Si	—	0.35
C	—	0.08
S	—	0.015
P	—	0.015
B	—	0.006
Cu	—	0.30

Metallurgical note: High nickel content (≥50%) provides exceptional resistance to chloride stress corrosion cracking. Chromium (14–23%) ensures oxidation resistance up to 1150°C. Molybdenum (in 625) and Nb+Ti (in 718/X-750) contribute to solid‑solution strengthening and precipitation hardening, giving these Inconel shoulder bolts their signature high‑temperature strength and corrosion resistance. Inconel 718's precipitation-hardened condition provides yield strengths exceeding 1035 MPa, ideal for high-stress pivot applications.

Complete Mechanical & Physical Properties – Inconel Shoulder Bolts (MPa / ksi)

Inconel shoulder bolts are supplied in solution annealed (600, 625, 601) or age‑hardened (718, X‑750) condition per specification. Data represent typical values based on ASTM, AMS, and industry standards. ksi values (kilopound per square inch) are provided alongside MPa.

Mechanical Properties – Typical Values (room temperature) for Shoulder Bolts

Grade / Condition	Tensile Strength (MPa)	Tensile Strength (ksi)	Yield Strength 0.2% (MPa)	Yield Strength 0.2% (ksi)	Elongation (%)	Hardness
Inconel 600 (annealed)	550-760	80-110	205-350	30-51	35-55	65-85 HRB
Inconel 625 (annealed)	827-930	120-135	414-517	60-75	30-42	≤95 HRB
Inconel 718 (age hardened)	1240-1455	180-211	1035-1180	150-171	12-21	36-44 HRC
Inconel X-750 (aged)	1170-1240	170-180	760-850	110-123	10-15	30-38 HRC
Inconel 601 (annealed)	550-650	80-94	240-300	35-43	30-35	≤88 HRB

Physical Properties (typical) – Inconel Shoulder Bolts

Property	Inconel 600	Inconel 625	Inconel 718	Inconel 601
Density (g/cm³)	8.47	8.44	8.19-8.22	8.11
Melting Range (°C)	1355-1413	1290-1350	1210-1344	1320-1370
Thermal Conductivity (W/m·K) at 20°C	14.9	9.8	11.4	11.2
Modulus of Elasticity (GPa)	214	205	200-205	207
Thermal Expansion (10⁻⁶/°C 20-100°C)	15.7	16.6	16.2	15.8

High‑Temperature Performance of Inconel Shoulder Bolts

Inconel superalloys retain significant strength at elevated temperatures, making Inconel shoulder bolts ideal for gas turbine linkages, furnace door pivots, and exhaust system components. Data below demonstrate the superiority of Inconel 718, 625, and 601 for high‑T applications.

Elevated Temperature Strength – Comparison by Grade

Grade	Maximum Service Temperature (oxidizing)	Tensile Strength at 650°C (MPa)	Tensile Strength at 650°C (ksi)	Characteristics
Inconel 600	1175°C (2150°F)	~250	~36	High strength at 650°C; good oxidation resistance
Inconel 625	982°C (1800°F)	~415	~60	Excellent strength up to 980°C; resists creep
Inconel 718	700°C (1300°F)	1160	168	Highest strength up to 700°C; retains 80% of RT strength at 650°C
Inconel 601	1150°C (2100°F)	~210	~30	Superior cyclic oxidation resistance due to aluminum addition

At 650°C, Inconel 718 retains about 80% of its room‑temperature tensile strength, outperforming many other alloys. Inconel 625 and 601 provide outstanding resistance to oxidation and carburization at even higher temperatures, making them excellent choices for high‑temperature shoulder bolts.

High‑Temperature Limits & Oxidation Resistance

Grade	Maximum Service Temperature (oxidizing)	Characteristics
Inconel 600	1175°C (2150°F)	High strength at 650°C; highest operating temperature in air is 1175°C
Inconel 625	982°C (1800°F)	Good tensile and fatigue properties below 980°C; resists creep
Inconel 718	700°C (1300°F)	High tensile and fatigue strength at 700°C; high oxidation resistance at 1000°C
Inconel 601	1150°C (2100°F)	Superior cyclic oxidation resistance due to aluminum addition; ideal for furnace fixtures

Exceptional Corrosion Resistance of Inconel Shoulder Bolts

The high nickel and chromium content imparts resistance to a wide range of corrosive media: chlorides, acids, and alkalis. Inconel 625 and Inconel 718 shoulder bolts are particularly resistant to pitting and crevice corrosion in seawater and sour environments.

Chloride stress corrosion cracking (SCC): All Inconel grades exhibit high resistance due to Ni >40%; immune to chloride-ion SCC.
Sulfuric & Hydrochloric acids: Inconel 625 shows exceptional performance in reducing acids (Mo addition).
Sour service (H₂S): Inconel 625 & 718 qualified per NACE MR0175/ISO 15156 for oil & gas.
Oxidation & carburization: Inconel 601 outperforms due to aluminum addition.
Seawater: Inconel 625 resists pitting and crevice corrosion, used extensively in marine fasteners.
High-purity water & alkalis: Inconel 600 offers excellent corrosion resistance in nuclear applications.
Neutral salts & mild environments: Inconel shoulder bolts experience virtually no attack in atmosphere, sea water, and alkaline media.

Manufacturing Standards – Inconel Shoulder Bolts

All Inconel shoulder bolts are manufactured and tested to meet:

NAS (NAS1802, NAS1351, NAS1352)MS (MS16995, MS20073-20083)AN (AN3-AN20 applicable head styles)ANSI B18.3 (socket head), B18.2.1 (hex head)ASTM B166, B446, B637ASME SB166, SB446SAE (AMS 5662, 5663, 5666, 5665, 5667)API 6A, 20FNACE MR0175 / ISO 15156ISO 7378 (shoulder bolt dimensions)DIN 912 (socket head), DIN 931 (hex)KS B1020, B1002

We offer surface finishes: passivation (ASTM A967), silver plating (AMS 2410 for anti‑seize), PTFE coating, electropolish, and ground finish on shoulder (Ra 0.4µm or better). Full traceability and destructive/non‑destructive testing available (UT, MPI, PMI).

Why RAYCHIN LIMITED – The Inconel Shoulder Bolt Authority

Precision grinding expertise: Decades of experience precision-grinding Inconel shoulders to tight tolerances (±0.025mm / ±0.001"). We ensure perfect concentricity and surface finish for reliable bearing surfaces. In‑house PMI verifies chemistry of every heat.

Global certifications: ISO 9001, AS9100D, PED, API Q1. All shoulder bolts supplied with EN 10204 3.1/3.2 certifications, NACE compliance when required.

Metallurgical expertise: Correct heat treatment: solution anneal for 600/625/601, age hardening for 718/X‑750 per AMS/ASTM schedules. Ensures optimal combination of shoulder hardness and core toughness.

Custom solutions: Special shoulder lengths, proprietary head styles, non‑standard thread/shoulder ratios, and tailored packaging. We support urgent delivery and JIT programs.

Contact the Inconel shoulder bolt experts

Request a quotation for Inconel shoulder bolts, stripper bolts, precision-ground shoulder bolts – any standard (NAS, MS, AN, ANSI, ASTM, ASME, API, NACE, ISO, DIN, KS) – any Inconel grade, any quantity. Global delivery. Mechanical data in MPa/ksi available for all products.

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